7. 4 7/15 + 2 4/5
Find the common denominator for 2 4/5 which is 15. Multiply by 3 for the numerator and denominator.
(4)(3)/(5)(3)=12/15
4 7/15+ 2 12/15=6 19/15= 7 4/15. ( subtract the numerator with the denominator 19-15=4)
Answer: 7 4/15
10 . 3 1/4-1 1/3
Find the common denominator for both of the fraction which is 12.
Multiply by 3 for 3 1/4. ( only for the numerator and denominator)
(1)(3)/4(3)=3/12
Multiply by 4 for 1 1/3. ( only for the numerator and denominator)
(1)(4)/(3)(4)=4/12
3 3/12- 1 4/12
Make the fractions into improper fractions. Multiply the whole number with the denominator.
3 3/12= 3*12=36. Add 36 with the numerator. 36+3=39
1 4/12=16/12
39/12-16/12=23/12=1 11/12
Answer: 1 11/12